# Copyright (c) 2019 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Stream profile for T-rex traffic generator.

Stream profile:
 - Two streams sent in directions 0 --> 1 and 1 --> 0 at the same time.
 - Packet: ETH / DOT1Q / IP / VXLAN / ETH / IP
 - Direction 0 --> 1:
   - VLAN range:                       100
   - Source IP address:                172.17.[0..9].2
   - Destination IP address:           172.16.0.1
   - Source UDP port:                  random([1024..65535])
   - Destination UDP port:             4789
   - VXLAN VNI:                        [0..9]
   - Payload source MAC address:       00:aa:aa:00:00:[00..ff]
   - Payload source IP address:        10.0.[0..255].2
   - Payload destination MAC address:  00:bb:bb:00:00:[00..ff]
   - Payload destination IP address:   10.0.[0..255].1
 - Direction 1 --> 0:
   - VLAN range:                       200
   - Source IP address:                172.27.[0..9].2
   - Destination IP address:           172.26.0.1
   - Source UDP port:                  random([1024..65535])
   - Destination UDP port:             4789
   - VXLAN VNI:                        [0..9]
   - Payload source MAC address:       00:bb:bb:00:00:[00..ff]
   - Payload source IP address:        10.0.[0..255].1
   - Payload destination MAC address:  00:aa:aa:00:00:[00..ff]
   - Payload destination IP address:   10.0.[0..255].2
"""

from trex.stl.api import *
from profile_trex_stateless_base_class import TrafficStreamsBaseClass

# RFC 7348 - Virtual eXtensible Local Area Network (VXLAN):
# A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks
# http://tools.ietf.org/html/rfc7348
_VXLAN_FLAGS = list('R'*24 + "RRRIRRRRR")


class VXLAN(Packet):
    name = 'VXLAN'
    fields_desc = [FlagsField('flags', 0x08000000, 32, _VXLAN_FLAGS),
                   ThreeBytesField('vni', 0),
                   XByteField('reserved', 0x00)]

    def mysummary(self):
        return self.sprintf("VXLAN (vni=%VXLAN.vni%)")


bind_layers(UDP, VXLAN, dport=4789)
bind_layers(VXLAN, Ether)


class TrafficStreams(TrafficStreamsBaseClass):
    """Stream profile."""

    def __init__(self):
        """Initialization and setting of streams' parameters."""

        super(TrafficStreamsBaseClass, self).__init__()

        self.nf_chains = 10

    def define_packets(self):
        """Defines the packets to be sent from the traffic generator.

        Packet definition: | ETH | DOT1Q | IP | VXLAN | ETH | IP

        :returns: Packets to be sent from the traffic generator.
        :rtype: tuple
        """

        # Direction 0 --> 1
        base_pkt_a = (
            Ether()/
            Dot1Q(vlan=100) /
            IP(src='172.17.0.2', dst='172.16.0.1')/
            UDP(sport=1024, dport=4789)/
            VXLAN(vni=0)/
            Ether(src='00:aa:aa:00:00:00', dst='00:bb:bb:00:00:00')/
            IP(src='10.0.0.2', dst='10.0.0.1', proto=61))

        # Direction 1 --> 0
        base_pkt_b = (
            Ether()/
            Dot1Q(vlan=200) /
            IP(src='172.27.0.2', dst='172.26.0.1')/
            UDP(sport=1024, dport=4789)/
            VXLAN(vni=0)/
            Ether(src='00:bb:bb:00:00:00', dst='00:aa:aa:00:00:00')/
            IP(src='10.0.0.1', dst='10.0.0.2', proto=61))

        # Direction 0 --> 1
        vm1 = STLScVmRaw([
            STLVmFlowVar(name='nf_id', size=1, op='inc',
                         min_value=0, max_value=self.nf_chains - 1),
            STLVmFlowVar(name='in_mac', size=2, op='inc',
                         min_value=0, max_value=255),
            STLVmFlowVar(name='in_ip', size=1, op='inc',
                         min_value=0, max_value=255),
            STLVmFlowVar(name='src_port', size=2, op='random',
                         min_value=1024, max_value=65535),
            STLVmWrFlowVar(fv_name='nf_id', pkt_offset=32),
            STLVmWrFlowVar(fv_name='src_port', pkt_offset='UDP.sport'),
            STLVmWrFlowVar(fv_name='nf_id', pkt_offset=52),
            STLVmWrFlowVar(fv_name='in_mac', pkt_offset=58),
            STLVmWrFlowVar(fv_name='in_mac', pkt_offset=64),
            STLVmWrFlowVar(fv_name='in_ip', pkt_offset=82),
            STLVmWrFlowVar(fv_name='in_ip', pkt_offset=86),
            STLVmFixIpv4(offset = 'IP')
        ])

        # Direction 1 --> 0
        vm2 = STLScVmRaw([
            STLVmFlowVar(name='nf_id', size=1, op='inc',
                         min_value=0, max_value=self.nf_chains - 1),
            STLVmFlowVar(name='in_mac', size=2, op='inc',
                         min_value=0, max_value=255),
            STLVmFlowVar(name='in_ip', size=1, op='inc',
                         min_value=0, max_value=255),
            STLVmFlowVar(name='src_port', size=2, op='random',
                         min_value=1024, max_value=65535),
            STLVmWrFlowVar(fv_name='nf_id', pkt_offset=32),
            STLVmWrFlowVar(fv_name='src_port', pkt_offset='UDP.sport'),
            STLVmWrFlowVar(fv_name='nf_id', pkt_offset=52),
            STLVmWrFlowVar(fv_name='in_mac', pkt_offset=58),
            STLVmWrFlowVar(fv_name='in_mac', pkt_offset=64),
            STLVmWrFlowVar(fv_name='in_ip', pkt_offset=82),
            STLVmWrFlowVar(fv_name='in_ip', pkt_offset=86),
            STLVmFixIpv4(offset = 'IP')
        ])

        return base_pkt_a, base_pkt_b, vm1, vm2

def register():
    """Register this traffic profile to T-rex.

    Do not change this function.

    :return: Traffic streams.
    :rtype: Object
    """
    return TrafficStreams()